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Note 4 - Securities (Tables)
12 Months Ended
Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]  
Schedule of Available-for-sale Securities Reconciliation [Table Text Block]
   

As of December 31, 2014

 
           

Gross

   

Gross

         
   

Amortized

   

Unrealized

   

Unrealized

   

Estimated

 

(Dollars in thousands)

 

Costs

   

Gains

   

Losses

   

Fair Value

 

Available-for-sale securities

                               

U.S. government & agencies

  $ 6,351     $ 58     $ (16 )   $ 6,393  

Obligations of state and political subdivisions

    52,629       1,788       (54 )     54,363  

Residential mortgage backed securities and collateralized mortgage obligations

    46,727       457       (169 )     47,015  

Corporate securities

    37,392       475       (133 )     37,734  

Commercial mortgage backed securities

    10,402       60       (73 )     10,389  

Other asset backed securities

    30,896       393       (197 )     31,092  

Total

  $ 184,397     $ 3,231     $ (642 )   $ 186,986  

Held-to-maturity securities

                               

Obligations of state and political subdivisions

  $ 36,806     $ 712     $ (400 )   $ 37,118  
   

As of December 31, 2013

 
           

Gross

   

Gross

         
   

Amortized

   

Unrealized

   

Unrealized

   

Estimated

 

(Dollars in thousands)

 

Costs

   

Gains

   

Losses

   

Fair Value

 

Available-for-sale securities

                               

U.S. government & agencies

  $ 6,580     $     $ (316 )   $ 6,264  

Obligations of state and political subdivisions

    60,370       672       (1,833 )     59,209  

Residential mortgage backed securities and collateralized mortgage obligations

    64,026       318       (1,353 )     62,991  

Corporate securities

    48,836       282       (888 )     48,230  

Commercial mortgage backed securities

    10,828       24       (380 )     10,472  

Other asset backed securities

    29,717       388       (631 )     29,474  

Total

  $ 220,357     $ 1,684     $ (5,401 )   $ 216,640  

Held-to-maturity securities

                               

Obligations of state and political subdivisions

  $ 36,696     $ 36     $ (2,707 )   $ 34,025  
Amortized Cost And Estimated Fair Value Available For Sale Securities Table [Text Block]
   

Available-For-Sale

   

Held-To-Maturity

 

(Dollars in thousands)

 

Amortized Cost

   

Fair Value

   

Amortized Cost

   

Fair Value

 

AMOUNTS MATURING IN:

                               

One year or less

  $ 1,671     $ 1,699     $ 241     $ 241  

One year through five years

    64,753       65,423       1,486       1,500  

Five years through ten years

    44,729       45,310       15,422       15,587  

After ten years

    73,244       74,554       19,657       19,790  

Total

  $ 184,397     $ 186,986     $ 36,806     $ 37,118  
Schedule of Financial Instruments Owned and Pledged as Collateral [Table Text Block]

(Dollars in thousands)

 

Amount

 

Public funds collateral

  $ 24,655  

Federal Home Loan Bank of San Francisco borrowings

    22,053  

Interest rate swap contracts

    3,533  

Total securities held for pledging purposes

  $ 50,241  
Schedule of Realized Gain (Loss) [Table Text Block]
   

For Years Ended December 31,

 

(Dollars in thousands)

 

2014

   

2013

   

2012

 

Proceeds from sales of securities

  $ 93,545     $ 103,303     $ 112,149  
                         

Gross realized gains on sales of securities:

                       

U.S. government & agencies

    32              

Obligations of state and political subdivisions

    268       261       2,710  

Residential mortgage backed securities and collateralized mortgage obligations

    102       250       594  

Corporate securities

    317       1,022       464  

Commercial mortgage backed securities

    4             43  

Other asset backed securities

    73       52       195  

Total gross realized gains on sales of securities

  $ 796     $ 1,585     $ 4,006  

Gross realized losses on sales of securities

                       

U.S. government & agencies

  $ (114 )   $ (100 )   $  

Obligations of state and political subdivisions

    (209 )     (215 )      

Residential mortgage backed securities and collateralized mortgage obligations

    (570 )     (199 )     (158 )

Corporate securities

    (8 )     (29 )     (16 )

Commercial mortgage backed securities

    (32 )           (10 )

Other asset backed securities

    (22 )     (47 )      

Total gross realized losses on sales of securities

  $ (955 )   $ (590 )   $ (184 )
Schedule of Unrealized Loss on Investments [Table Text Block]
   

As of December 31, 2014

 
   

Less Than 12 Months

   

12 Months or More

   

Total

 
   

Fair

   

Unrealized

   

Fair

   

Unrealized

   

Fair

   

Unrealized

 

(Dollars in thousands)

 

Value

   

Losses

   

Value

   

Losses

   

Value

   

Losses

 

Available-for-sale securities

                                               

U.S. government & agencies

  $     $     $ 1,269     $ (16 )   $ 1,269     $ (16 )

Obligations of states and political subdivisions

    3,952       (34 )     2,078       (20 )     6,030       (54 )

Residential mortgage backed securities and collateralized mortgage obligations

    10,193       (66 )     5,365       (103 )     15,558       (169 )

Corporate securities

    7,058       (36 )     6,542       (97 )     13,600       (133 )

Commercial mortgage backed securities

    4,912       (14 )     1,542       (59 )     6,454       (73 )

Other asset backed securities

    4,891       (16 )     6,088       (181 )     10,979       (197 )

Total temporarily impaired securities

  $ 31,006     $ (166 )   $ 22,884     $ (476 )   $ 53,890     $ (642 )

Held-to-maturity securities

                                               

Obligations of states and political subdivisions

  $ 1,556     $ (14 )   $ 12,726     $ (386 )   $ 14,282     $ (400 )
   

As of December 31, 2013

 
   

Less Than 12 Months

   

12 Months or More

   

Total

 
   

Fair

   

Unrealized

   

Fair

   

Unrealized

   

Fair

   

Unrealized

 

(Dollars in thousands)

 

Value

   

Losses

   

Value

   

Losses

   

Value

   

Losses

 

Available-for-sale securities

                                               

U.S. government & agencies

  $ 5,446     $ (147 )   $ 819     $ (168 )   $ 6,265     $ (316 )

Obligations of states and political subdivisions

    29,943       (1,578 )     2,727       (255 )     32,670       (1,833 )

Residential mortgage backed securities and collateralized mortgage obligations

    44,197       (1,214 )     3,271       (139 )     47,468       (1,353 )

Corporate securities

    32,649       (792 )     2,960       (96 )     35,609       (888 )

Commercial mortgage backed securities

    5,543       (205 )     1,437       (176 )     6,980       (380 )

Other asset backed securities

    15,303       (518 )     1,723       (113 )     17,026       (631 )

Total temporarily impaired securities

  $ 133,081     $ (4,454 )   $ 12,937     $ (947 )   $ 146,018     $ (5,401 )

Held-to-maturity securities

                                               

Obligations of states and political subdivisions

  $ 23,800     $ (1,524 )   $ 7,533     $ (1,183 )   $ 31,333     $ (2,707 )